Measuring instrument



A. N. HILL,l MEASURINGINSTRUMENT.

l APPLlcAiou mso Dc.24. 19m.l

Y UNITED sTATEs PATENT oEEicE.

ALFRED N ILSSON HILL, 0F LUND, SWEDEN.

MEASUEING INSTRUMENT.

Specication of lLetters Patent.

Application led December 24, 1918. Serial No. 268,131.

To all whom z't may concern: f

Be it known that I, ALFRED NILssoN HILL, a citizen of Sweden, residingat Lund, Sweden, have invented certain new and useful Improvements 'inMeasuring Instruments, of which the :following is a specification.

This invention relates to a measuring instrument provided with membranesfor transmitting the rectilinear motion of the membranes into a rotatingmotion of an indicator. i

In order to' obtain a transmission of this kind it has been proposed' touse a screw or the like connected with the indicator, said screw causinga rotating movement of the indicator by means of a nut connected withthe membrane. For the purpose of avoiding too great a: frictionalresistance a certain distance must bey provided between the nut and thescrew, and in this way the accuracy of the instrument will be lost.According to the present invention a hollow cylinder connected with theindicator and provided with two diametrically opposed ,helical slots isused for transmitting the movement, and al pin connected with themembrane and fitting in the slots is put l through said slots. At themovement of the membranes the pin causes the cylinder andv p the.indicator to rotate. i On account of the cylinder being provided withtwo slots `the l pinwill 'be guided in all directions and prevented fromvibrating, and thus an instrument is obtainedthat meets allrequirements.

. The invention is illustrated on ithe accompany-ing drawing. Figure 1is.' a-vertical section through the instrument. Fig. 2

is aside view of the same on a smaller scale,

and Fig. 3 is a plan lvie-w of Fig.'2.

The membranes, which maybe given any suitable form, consist in the formshown. of

4ing with each other. 45

twobellows shaped-members l communicat- The closed interior of saidmembers is connected with a pipe 2 through which a pressure aboveatmospheric or a vacuum may vbe-produced in the membranes in such a waythat they expand or` contract and lperform a rectilinear movement whichis to be transferred into a rotating movement of the indicator 3, inorder Two upright or supports 4 are providedi on the membrane nearesttothe. indicator.

pulsaftes the l tially moved.

,- Witnesses:

These supports are connected with each other at their upper free ends bymeans of a cross-piece or a pin 5. The indicator 8 is connected with ahollow cylinder 8 that is mounted in xed bearings 7 by means of the.journals 6 4and provided with two helical,

parallel slots `9 diametrically opposed to each other. The pin 5 is putthrough these slots. As the cylinder isnhollow the journals 6 areconnectedwith plugs l0 inserted in the ends of the cylinder.

When the membranes expand the sup- Patented J an. 27, 1920. I

ports 4 and the pin 5 are-moved upward in tened to a common bridge l1the indicator can easily be adjusted by moving the bridge in such a waythat the position of thel indilcator coincides with zero when theinstrument is out of service.

What I claim is Y 1. A'A measuring'instrument comprising a diaphragm,standards extending from.l the diaphragm," a rod connecting thestandards, top and bottom bearings, a cylinder mounted inthe bearings,said cylinder having two corresponding spiral slots through which therod extends, and a pointer carried by the cylinder, whereby when thediaphragm 2. A measuring instrument comprising a diaphragm, standardsextending from the diaphragm, upper and lower bearings supported abovethe diaphragm, ,a ycylinder .-mounted in the bearings, said cylinderhaving oppositely disposed corresponding splral slots, means extendingfrom the standards to engage the lslots and a pointer on the cylinderwhereby when the diaphragm is pulsated the pointer will be turned. v

In testimony whereof, Ifhave signed my name to this specification in thepresence of two subscribing witnesses.

'ALFRED NILSSON HILL.'

A. W. ANDERSON', v FRED FLERoN.

pointer will-be circumferen-

